/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.nutch.protocol.ftp;

import java.io.BufferedReader;
import java.io.StringReader;
import java.io.IOException;

import org.slf4j.Logger;

import org.apache.commons.net.ProtocolCommandEvent;
import org.apache.commons.net.ProtocolCommandListener;

/***
 * This is a support class for logging all ftp command/reply traffic.
 * 
 * @author John Xing
 ***/
public class PrintCommandListener implements ProtocolCommandListener {
	private Logger __logger;

	public PrintCommandListener(Logger logger) {
		__logger = logger;
	}

	public void protocolCommandSent(ProtocolCommandEvent event) {
		try {
			__logIt(event);
		} catch (IOException e) {
			if (__logger.isInfoEnabled()) {
				__logger.info(
						"PrintCommandListener.protocolCommandSent(): " + e);
			}
		}
	}

	public void protocolReplyReceived(ProtocolCommandEvent event) {
		try {
			__logIt(event);
		} catch (IOException e) {
			if (__logger.isInfoEnabled()) {
				__logger.info(
						"PrintCommandListener.protocolReplyReceived(): " + e);
			}
		}
	}

	private void __logIt(ProtocolCommandEvent event) throws IOException {
		if (!__logger.isInfoEnabled()) {
			return;
		}
		BufferedReader br = new BufferedReader(
				new StringReader(event.getMessage()));
		String line;
		while ((line = br.readLine()) != null) {
			__logger.info("ftp> " + line);
		}
	}
}
